Blasting wheel construction

Claim 1

A BLASTING WHEEL ASSEMBLY FOR PROJECTING A STREAM OF BLASTANT PARTICLES AT WORK ARTICLES, SAID ASSEMBLY INCLUDING A PROJECTING WHEEL WITH OUTWARDLY EXTENDING PROPELLING VANES, A WALLED HOUSING COVERING SAID WHEEL FOR GUARDING AGAINST THE ESCAPE OF PARTICLES IN ANY UNDESIRED DIRECTION, WEAR PLATES LINING SAID WALLED HOUSING, EACH OF SAID WEAR PLATES HAVING A HOUSING FACE DISPOSED TOWARD SAID HOUSING AND AN INTERIOR FACE DISPOSED TOWARD SAID WHEEL, SAID INTERIOR FACE BEING SMOOTH AND IMPERFORATE, SPACED BOSSES ON SAID HOUSING FACE OF EACH OF SAID WEAR PLATES PROJECTING THROUGH SAID WALLED HOUSING AND HAVING CAST IN PLACE NUTS THEREIN, AND THREADED FASTENERS SECURED TO EACH OF SAID NUTS AND TO SAID WALLED HOUSING.